DE1057478B - Bead protection arrangement for tubeless tires - Google Patents

Description

The invention relates to the beads of a pneumatic tire and more particularly relates to a bead protector assembly, with the help of which the tire beads are protected from the abrasion of the wheel rim. With the arrangement according to the invention is the escape of air from the interior of the tire through the Bead prevented through into the tire body.

It has already been proposed to use single polyamide or rayon threads to be designed and used as anti-chafing strips in order to increase the abrasion resistance. However, these threads are undesirably detached from the vulcanized rubber in which they are incorporated are embedded, so that to a certain extent tunnels are created through which the air can easily enter the Can seep into the tire body. On the other hand, while vulcanizing the Tire to ensure that there is sufficient one on the outer surface of the beads and the bead side walls thick rubber layer is retained; because the pressures and temperatures used during vulcanization have the consequence that some of the rubber is squeezed away from the bead surface, so that the Cord thread of the fabric layers or the anti-chafing strip are exposed.

According to the invention, the disadvantages of the known bead designs are eliminated in that the Tire bead is formed on the outside from a layer of individual polyamide threads, one side of which is attached to a layer of raw rubber is glued on, whereupon both layers are pre-vulcanized as a single strip before they are installed in the tire. The pre-vulcanized structure of superimposed The rubber and fabric layer is attached to the tire bead by means of a binder and then vulcanized a second time while vulcanizing the whole tire.

Further details and advantages of the invention will become apparent from the following description of one in FIG Drawing illustrated embodiment of the invention.

Fig. 1 shows a conventional tubeless tire in cross section; in

Fig. 2 is a diagrammatic illustration of a portion of a layer element formed in accordance with the invention; before it is installed in the tire;

Fig. 3 shows in a larger scale and in section a formed tire bead according to the invention prior to curing;

Fig. 4 shows in section a part of a finished tire bead designed according to the invention.

As shown in FIG. 1, a tubeless tire 1 is mounted on a drop center rim 2. The tire beads 3 are formed in a known manner from wire rings arranged in bundles, which are connected to the tire bead protection arrangement
for tubeless tires

Applicant:

The Firestone Tire Sd Rubber Company,
Akron, Ohio (V. St. A.)

Representative: Dipl.-Ing. K. Lengner, patent attorney,
Hamburg 1, Mönckebergstr. 7th

Claimed priority:
V. St. v. America September 18, 1957

are kept in connection by having the webs of fabric wrapped around them. Chafer strips 6, as is known, serve to protect the tire beads against the abrasive action of the rim flanges 5 to protect. The inner wall of the tire is, as is known, with a substantially air-impermeable Inner lining 7 covered, which extends from one to the other bead. The well-known cords or cords used in the areas of the beads that come into contact with the rim individual plastic threads of the chafer assembly sometimes become detached from the tire during operation Rubber in which they are embedded, so that continuous channels are formed in which the air can enter can reach distant places.

According to the invention, one is made of individual polyamide threads formed fabric used, which is impregnated in a known manner. The fabric 9 is then with a relatively thick strip of unvulcanized, but vulcanizable Rubber 8 (Fig. 2) connected, with the use of a binder; then this Pre-vulcanized structure at a temperature between 100 and 163 ° C. The vulcanized rubberized layer is then cut into strips to be used as anti-chafers to be used on the tire

... - - 909 510/163

Claims (1)

3 4 bead is applied. Then the tire claims:
vulcanized on the whole. The pre-vulcanized rubber fabric layer 8, 9, which contained the rubber im- 1. Bead protection arrangement for tubeless impregnated polyamide thread strips, is in tires whose beads on their circumference wholly or as a result of the pre-vulcanization so tight that they are partially from 5 a form consisting of rubber-impregnated vulcanization of the tire in a closed single thread layer of fabric is no longer deformed and squeezed away. are, characterized in that between the A rubber material, which has certain own outer, in a known manner from polyamide threads shafts for the layer 8, the bead cover layer (9) formed between the poly and the bead amide threads and the other parts of the tire bead io body a layer (8) made of a rubber has the following composition: polymer is arranged, which is bring to the bulges of the as yet unvulcanized Natural rubber 100.00 of the tire in a non-flowable state. Carbon black, 55.00 is vulcanized. Zinc oxide J, 50 _{ig 2} . Bead protection arrangement according to claim 1, there- Steannsaure J, characterized _by 00, that the fabric layer (9) Coumarone-indene resin 4.00 _{on hdaea pages with the} layer of one Phenol-aldehyde resin 10.00 rubber polymer is provided, the im Zinc mercaptobenzothiazole 0.50 finished tire facing the bead body Zinc dimethyldithiocarbamate 0.25 _2o rubber layer is thicker than the outer layer. Dibutylammon moleate 0.25 Sulfur 2.50 I _n publications considered: 179.00 German patent specification No. 879365. 1 sheet of drawings © 909 510/163 5.59